Arris SBG8300 Losing Connection Randomly and Acional Router Resets.

I have a new Arris SBG8300 and I randomly lose Internet connection. I have tried both a Wireless Adapter and Ethernet. Both do the same thing. Usually in about 20-30 minutes and the time does vary but mostly in 20-30 the Internet connection drops. I have talked to both Arris and Xfinity and Arris said that the QAM Upstream Power level should be between 47-49 for Optimum performance. It requires a Minimum of 45. The power level usually is 45 but sometimes is only 44. Arris said that if there is and fluctuation in the Power where it goes below 45 then it will drop connection. Xfinity sent somebody to check the outside lines and he said they were OK. He also said that he doesn't know why I was told about the power level because 25 to 37 was fine. Not if you read th Arris SBG8300 Specs they Explicitly State that the minimum is 45. I am pretty sure the power level is the problem. How can I get Xfinity to acknowledge that and Boost the Poer level to 47-49 or higher?